Hi David, thanks for your reply.
OK, that's effectively a problem.
But in fact, even the "exclude this location" (Spotlight preferences) doesn't work in Alfred! I excluded the "Office" folder inside the Apps folder (to avoid all the Office plugins showing up in apps, for ex. "Microsoft Clip Manager" showing when I want the clipboard function), but it doesn't work! Those apps still appear in my default results. (They don't appear in Spotlight searches, nor in Alfred when I do a file search).
I agree with you, and that's the same config as mine. But even then, yes, there's still some noise in the results.
What I do find very interesting is the "find specific file type" you're referring to: indeed, when I'm looking for a file, I know what kind of file it is. It's not the same to look for a .DOC, .PDF or an image... I haven't seen specific workflows to do that. And in fact, since it's so logical, why don't implement it directly in the file search function in Alfred?